Q: Unable to install ITUNES on Windows 7 64bit

I am trying to install itunes on a new laptop that runs windows 7 64bit.  I am getting an error message that says "the windows installer service could not be accessed.  this can occur if you are running windows in safe mode or if the windows installer is not correcty installed.  contact your support personnel for assistance."  I have tried several fix suggestions from ITUNES as well as microsoft support chats and none have worked.




Which version of iTunes are you trying to install?
Assuming that you are trying to install a compatible version of iTunes, you may try the methods mentioned below for "Windows Installer Service could not be accessed" error message:
Please tell us the troubleshooting steps which you have already tried so that we can try with some other troubleshooting steps.

Method 1: Right click on the setup file and, from the drop down menu, select 'run as administrator'
Method 2: Open command prompt in elevated mode and, then unregistered and re-register Windows Installer.

1. In the Start search box and then type 'cmd', when the command application appears at the top of the start window, right click on it and, from the drop down menu, select 'run as administrator' and type each of these commands in the command prompt and press Enter
   • msiexec /unregister 
   • msiexec /regserver

msiexec.exe belongs to the Windows Installer Component and is used to install new programs that use Windows Installer package files (MSI)

Method 3: Start the Windows Installer service

1. Click Start, type Services.msc and press {ENTER}
2. Double-click Windows Installer
3. Set the Startup type of Windows Installer to Manual
4. Click Start to start the service. Note down the error message if any.
5. Click OK.
If the above mentioned steps don’t resolve the issue, then
follow the steps and check whether you can resolve the issue:

Method 4: Empty your Temp directory and restart
1.       Choose Start > Computer
2.       In Computer, open the "C:" drive.
3.       Open the Users folder.
4.       Double-click the folder titled with your username.
5.       If you see an AppData folder, skip to step 10. If you don't see an AppData folder, proceed to the next step.
6.       Choose Organize > Folder and Search Options.
7.       Click the View tab.
8.       Select the option to "Show hidden files and folders." (In Windows 7 this option will be called "Show hidden files, folders, and drives").
9.       Click OK.
10.    Double-click the AppData folder to open it. If Windows needs your permission to continue click Continue.
11.    Double-click the Local folder to open it.
12.    Right-click on the Temp folder and choose Delete.
13.    In the confirmation dialog that appears click Yes.
14.    If you are unable to delete the Temp folder, close all programs, especially those in the Notification area ("System Tray") of the Windows Task bar and repeat step 12.
15.    Restart your computer.

Method 5: Removing iTunes

Note: iTunes Store purchases or songs imported from CDs are saved in your My Music folder by default and are not deleted by removing iTunes.
1.       Quit iTunes.
2.       From the Start menu, click Control Panel.
3.       In Control Panel, click Uninstall a program. The Programs and Features Control Panel opens.
Alternately, in Classic Panel of Control Panel, click Programs and Features.
4.       Select iTunes from the list of currently installed programs, then click Uninstall.
5.       When asked if you would like to remove iTunes, click Yes.
6.       After the uninstallation is complete, do not restart your computer if you are prompted to.
7.       If other program entries were listed for iTunes in Programs and Features remove those as well.
8.       In Programs and Features, also remove any iPod Updater applications that are listed in the same fashion as you removed iTunes.

Method 6: You may also try downloading the Windows Installer Cleanup utility and run that to remove the leftover ITunes installer files that may be causing issues with your current installation.

You may refer the following article to download the Windows Installer Cleanup Utility:
1. Click on Start > All Programs and then click Windows Install Cleanup; the Windows Installer Clean Up Utility window appears, listing software that is currently installed on your computer.
2. Select iTunes from the list and click Remove. If you have multiple iTunes files, remove all of them.
3. Once you have completed the above steps to Empty your Temp directory, Completely remove iTunes and QuickTime, and Clean up iTunes installer files on the computer, you can install the latest version of iTunes from

Thanks and Regards
Umesh P - Microsoft Support.

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Where are you starting the Install from, Itunes Site or from a downloaded file on your hard drive?

What browser are you using, if it is not IE, try an IE browser to get the download.


Have you tried right-clicking on the Setup program and selecting the "Run As Administrator" option?

How to troubleshoot a problem by performing a clean boot in Windows Vista or in Windows 7

Have you tried cleaning out your Temp folder, you can do it by typing %temp% in the Start Menu RUN box.  This will open your Temp folder, there you can delete everything that Windows will allow you to do so.

It may be necessary to show Both Hidden and System Files, and also to uncheck "Hide known file types" in Control Panel/ Folder Options/ View, to navigate to the mentioned Temp location.


Can you list what you have already tried otherwise we don't really know what to consider offering for a possible solution?

Have you tried the Support offered by your OEM, they are responsible for your support of Windows on an OEM machine.


Did this solve your problem?

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Views: 61,874 Last updated: July 4, 2018 Applies to: